Abstract In this paper, two types of carbon black (CB) masterbatch with different carriers, i.e. HDPE and LDPE, are used to produce black compounds using three PE100 resins with various short chain branching distributions. Due to difference in short chain branch (SCB) distribution, the used polyethylene resins behave differently in microstructure development and long-term creep behavior. The microstructural analysis using different DSC techniques and rheological measurements revealed more sensitivity of the polyethylene resin with uniform comonomer distribution to the carbon black aggregates and their polymeric carriers. The Full Notched Creep Test (FNCT) was performed to determine the long-term creep performance of the black compounds; it is shown that the sample having more uniform comonomer distribution is more resistant compared to other samples. On the other hand, by addition of carbon black masterbatch, resistance to slow crack growth in samples decreases since carbon black aggregates can act as stress concentration spots in the structure. However, with addition of the masterbatch with LDPE carrier polymer, the reduction of this value in samples is lower compared to one with HDPE carrier. The reason for this observation is that long branches of LDPE polymer enter the structure of lamellae in the PE100 resins, making them more coherent and increasing the number of tie molecules. The samples that are blended with LDPE polymer have a rougher surface, which means linkage between two sides of crack was stronger due to higher entanglement density in these samples. The impact test confirms the same trend as FNCT test, with the sample containing LDPE carrier having higher impact strength.

中文翻译：

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不同载体炭黑母粒存在下聚乙烯管材的长期力学性能

摘要 本文采用两种不同载体的炭黑(CB)母料，即HDPE和LDPE，使用三种不同短链支化分布的PE100树脂生产黑色化合物。由于短支链 (SCB) 分布的不同，所使用的聚乙烯树脂在微观结构发展和长期蠕变行为方面表现不同。使用不同 DSC 技术和流变测量的微观结构分析表明，具有均匀共聚单体分布的聚乙烯树脂对炭黑聚集体及其聚合物载体具有更高的敏感性。进行全缺口蠕变试验 (FNCT) 以确定黑色化合物的长期蠕变性能；结果表明，与其他样品相比，具有更均匀共聚单体分布的样品更耐腐蚀。另一方面，通过添加炭黑母料，由于炭黑聚集体可以作为结构中的应力集中点，因此样品对缓慢裂纹扩展的抵抗力降低。然而，与含有 HDPE 载体的母料相比，添加含有 LDPE 载体聚合物的母料后，样品中该值的降低幅度较低。这一观察结果的原因是 LDPE 聚合物的长支链进入了 PE100 树脂的薄片结构，使它们更加凝聚并增加了连接分子的数量。与 LDPE 聚合物共混的样品具有更粗糙的表面，这意味着由于这些样品中更高的缠结密度，裂纹两侧之间的连接更强。